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arXiv 1405.7571cs.MM
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JPEG第一次压缩循环后的噪音

JPEG Noises beyond the First Compression Cycle

Bin Li, Tian-Tsong Ng, Xiaolong Li, Shunquan Tan, Jiwu Huang

摘要:

研究了JPEG压缩过程中的量化噪声和舍入噪声。JPEG图像压缩过程中的第一个压缩周期的噪声已经得到了很好的研究,但到目前为止,对更高压缩周期的JPEG图像噪声的研究较少。在这项工作中,我们提出了一个统计分析的JPEG噪声超过第一个压缩周期。据我们所知,这是第一个关于这个主题的工作。我们发现,在较高的压缩周期的噪声分布是不同的,在第一个压缩周期,它们是依赖于两个连续的周期之间使用的量化参数。为了证明统计分析的好处,我们提供了两个应用程序,可以使用派生的噪声分布来揭示JPEG压缩历史与最先进的性能。

英文摘要:

This paper focuses on the JPEG noises, which include the quantization noise and the rounding noise, during a JPEG compression cycle. The JPEG noises in the first compression cycle have been well studied; however, so far less attention has been paid on the JPEG noises in higher compression cycles. In this work, we present a statistical analysis on JPEG noises beyond the first compression cycle. To our knowledge, this is the first work on this topic. We find that the noise distributions in higher compression cycles are different from those in the first compression cycle, and they are dependent on the quantization parameters used between two successive cycles. To demonstrate the benefits from the statistical analysis, we provide two applications that can employ the derived noise distributions to uncover JPEG compression history with state-of-the-art performance.

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